Brazilian federal authorities arrested Costa on March 20 following a money laundering investigation named “Operation Car Wash.” In the hope of receiving a lighter sentence, Costa named over 60 politicians whom he says were recipients of Petrobras money between 2002 and 2012.

Last week, O Estado de Sao Paulo newspaper, and Veja, a weekly magazine, published the names of the politicians. They included Edison Lobão; the minister for energy and mines; Renan Calheiros, the Senate president; Henrique Eduardo Alves; president of the lower house of Congress; and Eduardo Campos, a former governor.

The scandal has threatened to undermine Brazilian President Dilma Rousseff’s re-election chances when the country goes to the polls on October 5. “I assure you I will take the necessary action,” Roussef told reporters.” But I will not act based on speculation, I want the details.”

The scandal has pitted the two women – who both have claims to radical political backgrounds– against each other. Silva is a committed environmentalist while Roussef – a former urban guerilla who was arrested and tortured by a previous military dictatorship – calls herself a “developmentalist” promoting policies to exploit Brazil’s vast natural resources.

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